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After allowing a location description to be placed on a DWARF stack, in an effort to achieve a full composability of the DWARF expression, it is necessary to enable forming of a nested composite location descriptions. To be able do this, a new operation DW_OP_LLVM_piece_end needs to be introduced, along with some additional rules on the way how the composite location description is formed using the existing DW_OP_piece and DW_OP_bit_piece operations. These new rules are fully compatible with the composite forming rules from the DWARF 5 standard. More details on the new operation and added rules can be found here: https://llvm.org/docs/AMDGPUDwarfExtensionsForHeterogeneousDebugging.html gdb/ChangeLog: * compile/compile-loc2c.c (compute_stack_depth_worker): Add new DW_OP_LLVM_piece_end operation support. * dwarf2/expr.c (class dwarf_value): Add copy constructor. (class dwarf_location): Add copy constructor. (class dwarf_undefined): Add copy constructor. (class dwarf_memory): Add copy constructor. (class dwarf_register): Add copy constructor. (class dwarf_implicit): Add copy constructor. (class dwarf_implicit_pointer): Add copy constructor. (class dwarf_composite): Add copy constructor. (read_from_location): Add composite completed check. (write_to_location): Add composite completed check. (read_value_contents_from_location): New function. (dwarf_entry_factory::copy_entry): New method. (rw_closure_value): Now calls read_value_contents_from_location function. (dwarf_expr_context::add_piece): Use new composite forming rules. (dwarf_expr_context::execute_stack_op): Add new DW_OP_LLVM_piece_end operation support. * dwarf2/loc.c (dwarf2_get_symbol_read_needs): Add new DW_OP_LLVM_piece_end operation support. include/ChangeLog: * dwarf2.def (DW_OP_DUP): Add new DW_OP_LLVM_piece_end enumeration. gdb/testsuite/ChangeLog: * gdb.dwarf2/dw2-llvm-piece-end.exp: New test. Change-Id: Ib0b25e5de3f23df89d7d9e86aad56029c7d173df